Hilary Duff opens up to The Insider's Brooke Anderson about giving birth in March to her baby boy Luca Cruz, calling the event "the most special experience of my life." 

"It's really incredible. You just feel so much love wash over you and your heart just grows," Hilary tells Brooke. "It's just instant and there are really no words -- it was really, really incredible  and special for my husband and I both."

The Gossip Girl star also said the baby has absolutely brought her closer to her husband Mike Comrie, admitting that the birth did change their lives, "so much" for the better. "The most fun we have is at home staring at Luca and all of the new faces he's making, and bath time with him. It's just a wonderful new time for us and we're enjoying that."

When asked how she was able to get into such incredible shape so soon after the pregnancy, Hilary reports she's "feeling great" and is regularly exercising. "I was happy when my feet -- when the swelling in my feet went down. I was like, I just want to put a pair of heels on." She also revealed she's back in a routine of doing yoga, Pilates, even spinning. 

Watch the video for more of Hilary's interview and to learn about her involvement with the joint Save the Children and JOHNSON'S Baby Cares initiative, which provides funding and support for the healthy development of moms and babies who are in basic need of care during crisis situations. 

Zahvaljujući @KimmieMaree1994 dobili smo video od čitavoj intervjua kojeg je Hilary uradila sa Ellen uoči Dana Majki. :)

The singer and actress Hilary Duff joined the Johnson’s Baby to help launch the new platform of charity, Johnson’s Baby Cares. Thanks to a partnership with Save the Children, Hilary helped put together “care kits” that will be distributed to families in times of natural disasters. “In times of crisis, children are always more risks,” said Carolyn Miles, president of Save the Children. “The generous support of the JOHNSON’S ® Baby, and its parent company Johnson & Johnson, will help us meet the needs of thousands of mothers and children here in America and around the world.” “As a new mother, I am inspired by this worthy cause, which aims to give all mothers the opportunity to not only experience the joy of a healthy baby, but also an opportunity to be together and have moments of normality in crisis” said Hilary Duff. “I appreciate the opportunity to join JOHNSON’S ® Baby and Save the Children to offer a helping hand and make a difference.”

New mom Hilary Duff is 'fascinated' by changing baby Luca's diapers! The 24-year-old dishes her adventures as a new parent and more in an exclusive new interview with Life & Style.

Caption: New mom Hilary Duff is 'fascinated' by changing baby Luca's diapers

A little more than a month has passed since Hilary Duff welcomed son Luca into the world, and the new mom is already becoming a master at motherhood! In the new issue of Life & Style -- on newsstands now -- Hilary reveals her favorite moments with little Luca, her 'fascination' with changing diapers and what parental life is like for her and husband Mike Comrie!

Not so special for most parents? Changing diapers. But Hilary confides that the process "fascinates" her. "I'm so interested to see what's inside the diaper," Hilary tells Life & Style. "If my husband changes him, I'm like, 'Oh, what did we get?' It's bizarre!" Although Mike, 31, isn't quite the diaper detective, he has pleasantly surprised his wife with his devotion to their son.

"When Mike comes home, he says, 'Give me the baby; you've had him all day,'" shares Hilary (who's also busy working with Johnson's Baby Care campaign to help families affected by natural disasters). "He tells me, 'I can't stop kissing him; I'm sure it must bug him, but I can't stop.'"

"When you're single, you can pretty much do what you want all day, but Luca eats every three hours," the 24-year-old star tells Life & Style. "So then I have about an hour to run errands and get in a workout before I have to run back and feed the baby."

Luckily, Hilary doesn't mind. Though she initially found breast-feeding "tough," it's become a favorite time with her little guy. "We've bonded a lot during feeding. It's very, very special."

Read more inside Hilary's adventures as a new mom in this week's issue of Life & Style, on newsstands now!